
/*******************************************************************************
 * Copyright (c) 1991, 2018 IBM Corp. and others
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 *******************************************************************************/

/**
 * @file
 * @ingroup GC_Structs
 */

#include "j9.h"
#include "ModronAssertions.h"

#include "ConstantDynamicSlotIterator.hpp"


/**
 * Scan the current constant dynamic slot
 * @return slot value if it is not NULL
 * @return exception otherwise
 */
j9object_t*
GC_ConstantDynamicSlotIterator::nextSlot(j9object_t *slotPtr) {
	j9object_t *result;
	switch (_condySlotState) {
	case condy_slot_value:
		result = &(((J9RAMConstantDynamicRef *) slotPtr)->value);
		_condySlotState = condy_slot_exception;
		break;
	case condy_slot_exception:
		result = &(((J9RAMConstantDynamicRef *) slotPtr)->exception);
		_condySlotState = condy_slot_terminator;
		break;
	case condy_slot_terminator:
		result = NULL;
		_condySlotState = condy_slot_value;
		break;
	default:
		Assert_MM_unreachable();
		break;
	}
	return result;
}
